mirror of
https://github.com/rbock/sqlpp11.git
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169 lines
5.1 KiB
C++
169 lines
5.1 KiB
C++
/*
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* Copyright (c) 2013-2014, Roland Bock
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without modification,
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* are permitted provided that the following conditions are met:
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*
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* Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice, this
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* list of conditions and the following disclaimer in the documentation and/or
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* other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
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* ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef SQLPP_JOIN_H
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#define SQLPP_JOIN_H
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#include <sqlpp11/type_traits.h>
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#include <sqlpp11/on.h>
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#include <sqlpp11/vendor/noop.h>
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namespace sqlpp
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{
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struct inner_join_t
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{
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template<typename Db>
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struct _is_supported
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{
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static constexpr bool value = Db::_supports_inner_join;
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};
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static constexpr const char* _name = " INNER ";
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};
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struct outer_join_t
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{
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template<typename Db>
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struct _is_supported
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{
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static constexpr bool value = Db::_supports_outer_join;
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};
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static constexpr const char* _name = " OUTER ";
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};
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struct left_outer_join_t
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{
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template<typename Db>
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struct _is_supported
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{
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static constexpr bool value = Db::_supports_left_outer_join;
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};
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static constexpr const char* _name = " LEFT OUTER ";
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};
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struct right_outer_join_t
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{
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template<typename Db>
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struct _is_supported
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{
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static constexpr bool value = Db::_supports_right_outer_join;
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};
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static constexpr const char* _name = " RIGHT OUTER ";
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};
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template<typename JoinType, typename Lhs, typename Rhs, typename On = vendor::noop>
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struct join_t
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{
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using _traits = make_traits<no_value_t, tag::table, tag::join>;
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using _recursive_traits = make_recursive_traits<Lhs, Rhs>;
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static_assert(is_table_t<Lhs>::value, "lhs argument for join() has to be a table or join");
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static_assert(is_table_t<Rhs>::value, "rhs argument for join() has to be a table");
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static_assert(not is_join_t<Rhs>::value, "rhs argument for join must not be a join");
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static_assert(vendor::is_noop<On>::value or is_on_t<On>::value, "invalid on expression in join().on()");
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static_assert(::sqlpp::detail::is_disjunct_from<typename Lhs::_provided_tables, typename Rhs::_provided_tables>::value, "joined tables must not be identical");
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static_assert(_recursive_traits::_required_tables::size::value == 0, "joined tables must not depend on other tables");
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template<typename OnT>
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using set_on_t = join_t<JoinType, Lhs, Rhs, OnT>;
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template<typename... Expr>
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auto on(Expr... expr)
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-> set_on_t<on_t<void, Expr...>>
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{
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static_assert(vendor::is_noop<On>::value, "cannot call on() twice for a single join()");
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return { _lhs,
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_rhs,
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{std::tuple<Expr...>{expr...}}
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};
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}
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template<typename T>
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join_t<inner_join_t, join_t, T> join(T t)
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{
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static_assert(not vendor::is_noop<On>::value, "join type requires on()");
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return { *this, t };
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}
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template<typename T>
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join_t<inner_join_t, join_t, T> inner_join(T t)
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{
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static_assert(not vendor::is_noop<On>::value, "join type requires on()");
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return { *this, t };
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}
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template<typename T>
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join_t<outer_join_t, join_t, T> outer_join(T t)
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{
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static_assert(not vendor::is_noop<On>::value, "join type requires on()");
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return { *this, t };
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}
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template<typename T>
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join_t<left_outer_join_t, join_t, T> left_outer_join(T t)
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{
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static_assert(not vendor::is_noop<On>::value, "join type requires on()");
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return { *this, t };
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}
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template<typename T>
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join_t<right_outer_join_t, join_t, T> right_outer_join(T t)
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{
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static_assert(not vendor::is_noop<On>::value, "join type requires on()");
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return { *this, t };
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}
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Lhs _lhs;
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Rhs _rhs;
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On _on;
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};
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namespace vendor
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{
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template<typename Context, typename JoinType, typename Lhs, typename Rhs, typename On>
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struct serializer_t<Context, join_t<JoinType, Lhs, Rhs, On>>
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{
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using T = join_t<JoinType, Lhs, Rhs, On>;
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static Context& _(const T& t, Context& context)
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{
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static_assert(not vendor::is_noop<On>::value, "joined tables require on()");
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serialize(t._lhs, context);
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context << JoinType::_name;
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context << " JOIN ";
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serialize(t._rhs, context);
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serialize(t._on, context);
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return context;
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}
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};
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}
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}
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#endif
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